Maybe because they are untalented but try too hard... Like for the same reason Bakugo hates Deku or Tsukishima hates Hinata. Furrina
The only thing is that Hinata is kinda shorts that all. I think Nacht hate the black bulls is because they are trying to do things they " arent made to do " like how Hinata is short for volleyball and how Deku has no quirk Natch hates people trying to change their faith? Well thats what i think
I don't know but I love Nacht but I'm still wondering why did he hate Yami and Black bulls so much! hmm